KQL query nested field support (elastic#116467)

Author: afoucret

server/src/main/java/org/elasticsearch/index/query/NestedQueryBuilder.java

@@ -112,6 +112,13 @@ public QueryBuilder query() {
         return query;
     }
 
+    /**
+     * Returns path to the searched nested object.
+     */
+    public String path() {
+        return path;
+    }
+
     /**
      * Returns inner hit definition in the scope of this query and reusing the defined type and query.
      */

x-pack/plugin/kql/src/main/antlr/KqlBase.g4

@@ -46,9 +46,26 @@ notQuery:
    ;
 
 nestedQuery
-    : fieldName COLON LEFT_CURLY_BRACKET query RIGHT_CURLY_BRACKET
+    : fieldName COLON LEFT_CURLY_BRACKET nestedSubQuery RIGHT_CURLY_BRACKET
     ;
 
+nestedSubQuery
+    : <assoc=right> nestedSubQuery operator=(AND|OR) nestedSubQuery #booleanNestedQuery
+    | nestedSimpleSubQuery                                          #defaultNestedQuery
+    ;
+
+nestedSimpleSubQuery
+    : notQuery
+    | nestedQuery
+    | matchAllQuery
+    | nestedParenthesizedQuery
+    | existsQuery
+    | rangeQuery
+    | fieldQuery;
+
+nestedParenthesizedQuery
+    : LEFT_PARENTHESIS nestedSubQuery RIGHT_PARENTHESIS;
+
 matchAllQuery
     : (WILDCARD COLON)? WILDCARD
     ;

x-pack/plugin/kql/src/main/java/module-info.java

@@ -13,6 +13,7 @@
     requires org.apache.lucene.queryparser;
     requires org.elasticsearch.logging;
     requires org.apache.lucene.core;
+    requires org.apache.lucene.join;
 
     exports org.elasticsearch.xpack.kql;
     exports org.elasticsearch.xpack.kql.parser;

x-pack/plugin/kql/src/main/java/org/elasticsearch/xpack/kql/parser/KqlAstBuilder.java

@@ -9,6 +9,7 @@
 
 import org.antlr.v4.runtime.ParserRuleContext;
 import org.antlr.v4.runtime.Token;
+import org.apache.lucene.search.join.ScoreMode;
 import org.elasticsearch.common.regex.Regex;
 import org.elasticsearch.index.mapper.MappedFieldType;
 import org.elasticsearch.index.query.BoolQueryBuilder;
@@ -20,6 +21,7 @@
 import org.elasticsearch.index.query.QueryStringQueryBuilder;
 import org.elasticsearch.index.query.RangeQueryBuilder;
 
+import java.util.List;
 import java.util.Set;
 import java.util.function.BiConsumer;
 import java.util.function.BiFunction;
@@ -56,15 +58,15 @@ public QueryBuilder toQueryBuilder(ParserRuleContext ctx) {
     @Override
     public QueryBuilder visitBooleanQuery(KqlBaseParser.BooleanQueryContext ctx) {
         assert ctx.operator != null;
-        return isAndQuery(ctx) ? visitAndBooleanQuery(ctx) : visitOrBooleanQuery(ctx);
+        return isAndQuery(ctx) ? visitAndBooleanQuery(ctx.query()) : visitOrBooleanQuery(ctx.query());
     }
 
-    public QueryBuilder visitAndBooleanQuery(KqlBaseParser.BooleanQueryContext ctx) {
+    public QueryBuilder visitAndBooleanQuery(List<? extends ParserRuleContext> clauses) {
         BoolQueryBuilder builder = QueryBuilders.boolQuery();
 
         // TODO: KQLContext has an option to wrap the clauses into a filter instead of a must clause. Do we need it?
-        for (ParserRuleContext subQueryCtx : ctx.query()) {
-            if (subQueryCtx instanceof KqlBaseParser.BooleanQueryContext booleanSubQueryCtx && isAndQuery(booleanSubQueryCtx)) {
+        for (ParserRuleContext subQueryCtx : clauses) {
+            if (isAndQuery(subQueryCtx)) {
                 typedParsing(this, subQueryCtx, BoolQueryBuilder.class).must().forEach(builder::must);
             } else {
                 builder.must(typedParsing(this, subQueryCtx, QueryBuilder.class));
@@ -74,11 +76,11 @@ public QueryBuilder visitAndBooleanQuery(KqlBaseParser.BooleanQueryContext ctx)
         return rewriteConjunctionQuery(builder);
     }
 
-    public QueryBuilder visitOrBooleanQuery(KqlBaseParser.BooleanQueryContext ctx) {
+    public QueryBuilder visitOrBooleanQuery(List<? extends ParserRuleContext> clauses) {
         BoolQueryBuilder builder = QueryBuilders.boolQuery().minimumShouldMatch(1);
 
-        for (ParserRuleContext subQueryCtx : ctx.query()) {
-            if (subQueryCtx instanceof KqlBaseParser.BooleanQueryContext booleanSubQueryCtx && isOrQuery(booleanSubQueryCtx)) {
+        for (ParserRuleContext subQueryCtx : clauses) {
+            if (isOrQuery(subQueryCtx)) {
                 typedParsing(this, subQueryCtx, BoolQueryBuilder.class).should().forEach(builder::should);
             } else {
                 builder.should(typedParsing(this, subQueryCtx, QueryBuilder.class));
@@ -100,8 +102,40 @@ public QueryBuilder visitParenthesizedQuery(KqlBaseParser.ParenthesizedQueryCont
 
     @Override
     public QueryBuilder visitNestedQuery(KqlBaseParser.NestedQueryContext ctx) {
-        // TODO: implementation
-        return new MatchNoneQueryBuilder();
+        String nestedFieldName = extractText(ctx.fieldName());
+
+        if (kqlParsingContext.isNestedField(nestedFieldName) == false) {
+            throw new KqlParsingException(
+                "[{}] is not a valid nested field name.",
+                ctx.start.getLine(),
+                ctx.start.getCharPositionInLine(),
+                nestedFieldName
+            );
+        }
+        QueryBuilder subQuery = kqlParsingContext.withNestedPath(
+            nestedFieldName,
+            () -> typedParsing(this, ctx.nestedSubQuery(), QueryBuilder.class)
+        );
+
+        if (subQuery instanceof MatchNoneQueryBuilder) {
+            return subQuery;
+        }
+
+        return wrapWithNestedQuery(
+            nestedFieldName,
+            QueryBuilders.nestedQuery(kqlParsingContext.fullFieldName(nestedFieldName), subQuery, ScoreMode.None)
+        );
+    }
+
+    @Override
+    public QueryBuilder visitBooleanNestedQuery(KqlBaseParser.BooleanNestedQueryContext ctx) {
+        assert ctx.operator != null;
+        return isAndQuery(ctx) ? visitAndBooleanQuery(ctx.nestedSubQuery()) : visitOrBooleanQuery(ctx.nestedSubQuery());
+    }
+
+    @Override
+    public QueryBuilder visitNestedParenthesizedQuery(KqlBaseParser.NestedParenthesizedQueryContext ctx) {
+        return typedParsing(this, ctx.nestedSubQuery(), QueryBuilder.class);
     }
 
     @Override
@@ -116,7 +150,7 @@ public QueryBuilder visitExistsQuery(KqlBaseParser.ExistsQueryContext ctx) {
         BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery().minimumShouldMatch(1);
         withFields(ctx.fieldName(), (fieldName, mappedFieldType) -> {
             if (isRuntimeField(mappedFieldType) == false) {
-                boolQueryBuilder.should(QueryBuilders.existsQuery(fieldName));
+                boolQueryBuilder.should(wrapWithNestedQuery(fieldName, QueryBuilders.existsQuery(fieldName)));
             }
         });
 
@@ -137,7 +171,7 @@ public QueryBuilder visitRangeQuery(KqlBaseParser.RangeQueryContext ctx) {
                 rangeQuery.timeZone(kqlParsingContext.timeZone().getId());
             }
 
-            boolQueryBuilder.should(rangeQuery);
+            boolQueryBuilder.should(wrapWithNestedQuery(fieldName, rangeQuery));
         });
 
         return rewriteDisjunctionQuery(boolQueryBuilder);
@@ -200,24 +234,33 @@ public QueryBuilder visitFieldQuery(KqlBaseParser.FieldQueryContext ctx) {
             }
 
             if (fieldQuery != null) {
-                boolQueryBuilder.should(fieldQuery);
+                boolQueryBuilder.should(wrapWithNestedQuery(fieldName, fieldQuery));
             }
         });
 
         return rewriteDisjunctionQuery(boolQueryBuilder);
     }
 
-    private static boolean isAndQuery(KqlBaseParser.BooleanQueryContext ctx) {
-        return ctx.operator.getType() == KqlBaseParser.AND;
+    private static boolean isAndQuery(ParserRuleContext ctx) {
+        return switch (ctx) {
+            case KqlBaseParser.BooleanQueryContext booleanQueryCtx -> booleanQueryCtx.operator.getType() == KqlBaseParser.AND;
+            case KqlBaseParser.BooleanNestedQueryContext booleanNestedCtx -> booleanNestedCtx.operator.getType() == KqlBaseParser.AND;
+            default -> false;
+        };
     }
 
-    private static boolean isOrQuery(KqlBaseParser.BooleanQueryContext ctx) {
-        return ctx.operator.getType() == KqlBaseParser.OR;
+    private static boolean isOrQuery(ParserRuleContext ctx) {
+        return switch (ctx) {
+            case KqlBaseParser.BooleanQueryContext booleanQueryCtx -> booleanQueryCtx.operator.getType() == KqlBaseParser.OR;
+            case KqlBaseParser.BooleanNestedQueryContext booleanNestedCtx -> booleanNestedCtx.operator.getType() == KqlBaseParser.OR;
+            default -> false;
+        };
     }
 
     private void withFields(KqlBaseParser.FieldNameContext ctx, BiConsumer<String, MappedFieldType> fieldConsummer) {
         assert ctx != null : "Field ctx cannot be null";
         String fieldNamePattern = extractText(ctx);
+
         Set<String> fieldNames = kqlParsingContext.resolveFieldNames(fieldNamePattern);
 
         if (ctx.value.getType() == KqlBaseParser.QUOTED_STRING && Regex.isSimpleMatchPattern(fieldNamePattern)) {
@@ -267,4 +310,14 @@ private BiFunction<RangeQueryBuilder, String, RangeQueryBuilder> rangeOperation(
             default -> throw new IllegalArgumentException(format(null, "Invalid range operator {}\"", operator.getText()));
         };
     }
+
+    private QueryBuilder wrapWithNestedQuery(String fieldName, QueryBuilder query) {
+        String nestedPath = kqlParsingContext.nestedPath(fieldName);
+
+        if (nestedPath == null || nestedPath.equals(kqlParsingContext.currentNestedPath())) {
+            return query;
+        }
+
+        return wrapWithNestedQuery(nestedPath, QueryBuilders.nestedQuery(nestedPath, query, ScoreMode.None));
+    }
 }

x-pack/plugin/kql/src/main/java/org/elasticsearch/xpack/kql/parser/KqlBase.interp

@@ -42,6 +42,9 @@ query
 simpleQuery
 notQuery
 nestedQuery
+nestedSubQuery
+nestedSimpleSubQuery
+nestedParenthesizedQuery
 matchAllQuery
 parenthesizedQuery
 rangeQuery
@@ -54,4 +57,4 @@ fieldName
 
 
 atn:
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15, 11, 15, 12, 15, 143, 1, 15, 3, 15, 147, 8, 15, 1, 15, 1, 15, 3, 15, 151, 8, 15, 1, 15, 1, 15, 3, 15, 155, 8, 15, 1, 15, 3, 15, 158, 8, 15, 1, 16, 1, 16, 1, 16, 3, 16, 163, 8, 16, 1, 16, 0, 2, 2, 10, 17, 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 0, 4, 1, 0, 2, 3, 1, 0, 6, 9, 2, 0, 14, 14, 16, 16, 1, 0, 2, 4, 177, 0, 35, 1, 0, 0, 0, 2, 39, 1, 0, 0, 0, 4, 58, 1, 0, 0, 0, 6, 60, 1, 0, 0, 0, 8, 63, 1, 0, 0, 0, 10, 69, 1, 0, 0, 0, 12, 86, 1, 0, 0, 0, 14, 88, 1, 0, 0, 0, 16, 94, 1, 0, 0, 0, 18, 98, 1, 0, 0, 0, 20, 102, 1, 0, 0, 0, 22, 112, 1, 0, 0, 0, 24, 114, 1, 0, 0, 0, 26, 128, 1, 0, 0, 0, 28, 135, 1, 0, 0, 0, 30, 157, 1, 0, 0, 0, 32, 162, 1, 0, 0, 0, 34, 36, 3, 2, 1, 0, 35, 34, 1, 0, 0, 0, 35, 36, 1, 0, 0, 0, 36, 37, 1, 0, 0, 0, 37, 38, 5, 0, 0, 1, 38, 1, 1, 0, 0, 0, 39, 40, 6, 1, -1, 0, 40, 41, 3, 4, 2, 0, 41, 47, 1, 0, 0, 0, 42, 43, 10, 2, 0, 0, 43, 44, 7, 0, 0, 0, 44, 46, 3, 2, 1, 2, 45, 42, 1, 0, 0, 0, 46, 49, 1, 0, 0, 0, 47, 45, 1, 0, 0, 0, 47, 48, 1, 0, 0, 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